.btu-calculator-container{display:flex;justify-content:center;align-items:center;min-height:100vh}.btu-calculator{background:#fff;padding:30px;border-radius:10px;box-shadow:0 4px 8px rgba(0,0,0,.1);max-width:500px;width:100%}.btu-calculator label{font-weight:700;margin-top:10px;color:#555}.btu-calculator input,.btu-calculator select{width:100%;padding:10px;margin-top:5px;margin-bottom:15px;border:1px solid #ddd;border-radius:5px;background:#f9f9f9}.btu-calculator button{width:100%;padding:15px;background-color:#fbba49;color:white;border:none;border-radius:5px;font-size:16px;cursor:pointer;transition:background-color .3s}.btu-calculator button:hover{background-color:#282832}.btu-calculator .result{text-align:center;margin-top:20px;font-size:1.2em;font-weight:700;color:#333}.dt-container .dt-input{display:inline;font-size:inherit;padding:5px;width:auto;border:1px solid}